spherulite

[sfer-oo-lahyt, -yoo-, sfeer-]
noun Petrology.
a rounded aggregate of radiating crystals found in obsidian and other glassy igneous rocks.

Origin:
1815–25; spherule + -ite1

spherulitic [sfer-oo-lit-ik, -yoo-, sfeer-] , adjective
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World English Dictionary
spherulite (ˈsfɛrʊˌlaɪt)
 
n
any of several spherical masses of radiating needle-like crystals of one or more minerals occurring in rocks such as obsidian
 
spherulitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The chemical structure of the fatty acid is thus not the only factor controlling spherulite morphology.
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